try this format
diff --git a/setup.py b/setup.py
index 86f0379..388ab7c 100644
--- a/setup.py
+++ b/setup.py
@@ -79,7 +79,7 @@
 
 setup(
     name='datasketches',
-    version='2.2.0',
+    version='2.2.0.dev0',
     author='Apache Datasketches Developers',
     author_email='dev@datasketches.apache.org',
     description='A wrapper for the C++ Apache Datasketches library',